St. Louis Science Center in Missouri features family camp-ins at their Planetarium.

(Courtesy St. Louis Science Center)

Parents and children explore the Life Science Lab at the St. Louis Science Center.

(Courtesy St. Louis Science Center)

Planetarium where the kids sleep at St. Louis Science Center.

(Debbie Franke)

A crowd watches a demo at the St. Louis Science Center.

(Courtesy St. Louis Science Center)

Carnegie Natural History Museum in Pittsburgh, Pennsylvania allows kids ages 6 to 14 to take advantage of their "overnight adventures" program.

(Courtesy Carnegie Museum of Natural History)

Kids look at an exhibit at Carnegie Natural History Museum.

(Courtesy Carnegie Museum of Natural History)

Visitors inspect the zebras in the African Savanna diorama at Carnegie Natural History Museum.

(Courtesy Carnegie Museum of Natural History)

Kids collecting and identifying specimens at the Carnegie Natural History Museum.

(Courtesy Carnegie Museum of Natural History)

The exterior of the International Spy Museum in Washington, D.C.

(Courtesy International Spy Museum)

A look at the "School for Spies" Gallery at International Spy Museum. Children aged 9 to 13 can take part in code breaking, disguise making, spy games, and breakfast when they spend the night at the museum.

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